18959606489 has 4 divisors (see below), whose sum is σ = 19472028324. Its totient is φ = 18447184656.

The previous prime is 18959606453. The next prime is 18959606527. The reversal of 18959606489 is 98460695981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98460695981 = 389 ⋅253112329.

It can be written as a sum of positive squares in 2 ways, for example, as 7294526464 + 11665080025 = 85408^2 + 108005^2 .

It is a cyclic number.

It is not a de Polignac number, because 18959606489 - 2⁸ = 18959606233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18959606089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256210862 + ... + 256210935.

It is an arithmetic number, because the mean of its divisors is an integer number (4868007081).

Almost surely, 2^18959606489 is an apocalyptic number.

It is an amenable number.

18959606489 is a deficient number, since it is larger than the sum of its proper divisors (512421835).

18959606489 is an equidigital number, since it uses as much as digits as its factorization.

18959606489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512421834.

The product of its (nonzero) digits is 33592320, while the sum is 65.

The spelling of 18959606489 in words is "eighteen billion, nine hundred fifty-nine million, six hundred six thousand, four hundred eighty-nine".